Your advice worked perfectly and easily, Jiaz.
Thank you for the help.
By the way, the workaround for the issue regarding JD2 only processing 100 videos works like this: 1) Click on a YouTube channel name 2) On the channel page, click "videos" 3) On the videos page, click "play all" 4) At the top of the playlist of the entire channel, on the right side of the page, click the top title - ie, "uploads from [channel name]" 5) The playlist will show 100 videos, but when you scroll down to the very bottom, another 100 videos will appear. 100 videos will keep appearing every time you scroll to the bottom of the page, until all videos are shown on the page. This is even true for channels with many hundreds of videos. 6) After you've scrolled down as often as it takes to show all the videos in the channel, go to the bottom of the page and click and drag up until all videos are highlighted. 7) Assuming you have a browser plugin that lets you, right-click on "copy all selected videos". By default, Mac Firefox only lets you copy one link at a time, so you need an additional Firefox plugin to copy multiple links. I assume this is true for other browsers as well.
If you have the clipboard observer enabled in JD2, this will then read all videos in the channel into the LinkGrabber, not just 100.